Answer:
[tex]f=\frac{D^{2} - Δ^{2} }{4D}[/tex]
this is formula of finding focal length using displacement method.
f:− focal length
Δ:− displacement of lens done in order to get image again on screen.
D:− distance between object and screen.
on putting the values ,
[tex]\frac{20^{2} -2^{2} }{80}[/tex]
[tex]\frac{396}{80}[/tex]
4.95 cm therefore, (2) option is correct
Explanation:
Air 1.0003
Water 1.33
benzene 1.5
Kerosene 1.44
a) Find the speed of light in Benzene?
b) Write S.I unit of refractive index.
c) Draw the diagram to show refraction of light when it travel from Benzene to air ? d) What are the factors the refractive index depends on ?
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Answers & Comments
Answer:
[tex]f=\frac{D^{2} - Δ^{2} }{4D}[/tex]
this is formula of finding focal length using displacement method.
f:− focal length
Δ:− displacement of lens done in order to get image again on screen.
D:− distance between object and screen.
on putting the values ,
[tex]\frac{20^{2} -2^{2} }{80}[/tex]
[tex]\frac{396}{80}[/tex]
4.95 cm therefore, (2) option is correct
Explanation:
Air 1.0003
Water 1.33
benzene 1.5
Kerosene 1.44
a) Find the speed of light in Benzene?
b) Write S.I unit of refractive index.
c) Draw the diagram to show refraction of light when it travel from Benzene to air ? d) What are the factors the refractive index depends on ?